If you thought the wait for tomorrow’s 200th episode was excruciating, brace yourself for this.

EW has learned exclusively thatLord of the Rings star Sean Astin is set to appear alongside already announced guest star Jamie Lee Curtis in an upcoming episode of NCIS, scheduled to air in late March. Astin will, like Curtis, play a psychological operations investigator.

“I’ve been a big fan of Sean’s for years and this is a part we literally tailored for him,” says executive producer Gary Glasberg. “We couldn’t be happier to have Sean join us. Jamie’s character, Doctor Ryan, oversees a team of brilliant PsyOps agents and Sean will prove to be her go-to operative. We can’t wait to throw him into the mix, watch it develop, and have some fun.”

Curtis was supposed to reunite with her Freaky Friday co-star Mark Harmon and his NCIS team in August, but her appearance was postponed. Our verdict? It was worth the wait.